Process of treating cement mixtures for the recovery of potassium compounds.



own 1 e in in r .Aiililw BLUMENBERG, J31, CF 033.0 GRANDE, CALIF? CGBZPGUNDS.

Applicetion filed March 15,

' To (ZZZ whom it "fl/6 concern:

lie it known that HENRY BLUMENBERG, J 1, a citizen of the United States, residing at @ro Grande, in county of San Bernardino and State of California, have invented new and useful ln'iprovements in Processes of Treating Cement Mixtures for the Recovery of Potassium Compounds, of which the following is a specification.

My invention rela es to a process of recovering potassium compounds carried by the hot waste oases of cement kilns, metalurgical :Eurn and like.

In the reco, of p ca um compounds as a hy-product come .,.ns. a potassium containing mineral sucn. as feldspar, shale and the like is used as one of the raw materials in the manufacture of cement. The high temperature of the cement kiln volatih izes the potassium compounds, mostly in the form of potassium oxid K 0, which in conjunction with cement dust and products of combustion is carried by the hot gases which treated in a suitable apparatus for preopitating and recovering the solid matter carried therein. The potassium may he recovered in the form of a potassium t such as sulfate chlorid, nitrate, or carbonate, depending on the re-agent used in treating-the hot it 15 the principal ob ect of this invention to treat theravv cement material or mix as it is called to increase the volatility of the potassium contained in the mix. it has been sug 'ested to add re-agents such as sodium chlorid, calcium chlorid,- calcium fluorid, sulfur dioxid, steam and the like with the mix to'increase the volatility of the potassium compound. Vl hile a measure of success has attended the use of such rcagents, I have discovered that by using a small amount of a metal nitrate with the mix, I not only increase the volatility of the potassium compound. therein, but the nitrogen oxid generated is utilized and recovered in the subsequent precipitation of the potassium oxid carried by the hot in the form of potassium nitrate, which is an excellent fertilizer. v

invention consists in the steps of the process hereinafter described and claimed. To the cement mix comprising a potassium containing mineral such as shale, I add one Specification of Letters Patent.

1516. Serial No. 222,73

to two per cent. of sodium nitrate. niece of sodium nitrate, any other metal In may be used. The volatilit of tl siuni compounds is increased. appron 10% of the recovery, when a cement mix is used,- Without the addition of sodium nitrate.

The Waste carrying" cement dust, products of combustion potassium compounds, are led to a coolii chamber Where a large portion of their Waste heat is given oil. and utilized for heating and con entrat ing the slurry or magma eontai recovered potassium compounds. pendiig application a pr coveringpot: ssium and apparatus therefor, Serial No. 2142153, filed January 28th, 1918, I have described a process and apparatus for recovering potassium carried in hot gases. The cooling of the gases decreases their volume and checks their velocity, thereby causing a large portion of the dust to be deposited. The cooled gases are then caused to pass through a precipitating ehamher where they come in contact with the fine spray of a liquid re-ag'ent which may be calcium sulfate, calcium chlorichsodium nitrate and the like, which recovers the potassium compounds, which may be, after concentration, easily separated by filtration from the insoluble calcium carbonate and the like, or the concentrated and dried slurry or magma containing the potass um compounds may be used as a fertilizer Without any previous separation of the potassium compounds from the other solids.

I claim:

l. .t process of treating cement mix to increase the volatility of the potassium com pounds contained therein. comprising adding a small perccnta 'e of a metal nitrate.

A. process of treating cement mix to increase the volatility of the potassium com.- pounds contained therein, comprising adding a small percentage sodium nitrate.

3. A process of treating cement mix to increase the volatility of the potassium compounds contained therein, cmnprising adding one to two per cent. of sodium nitrate.

In testimony whereof I have signed my name to this specification.

HENRY BLUMEuBnno, .53.

Bil

Hill 

